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我想知道用户是否可以添加到 html5 网页的元素中？例如，他们是否可以将段落或图像添加到以前不存在的现有网页中？

例如。

<!doctype html>
    <html>
    <head>
    </head>
    <body>
    <p class=”pClass”&gt;This is in a paragraph.</p>

    **//would it be possible for a user to insert several paragraphs here with the click of a button or something?**


    </body>
    </html>
4

3 回答 3

2

我做这个可能有点过头了，但我总是喜欢创建这些小例子。这就是我想出的。从这个 HTML 开始：

<input type="text" id="txt1" />
<button id="btn1">Add Item</button>
<hr />
<div id="targetArea"></div>

这个CSS：

p.editable input.editor,
p.editable input.action,
p.editable em.escape {
    display: none;
}

p.editable input.action {
    margin-left: 15px;
}

p.editable em.escape {
    margin-left: 10px;
    font-size: 8px;
}

p.editable:hover input.action {
    display: inline;
}

p.editable.editing span.text {
    display: none !important;
}

p.editable.editing input.editor,
p.editable.editing input.action,
p.editable.editing em.escape {
    display: inline !important;
}

并使用这个 JavaScript：

var textProp = "textContent" in document.createElement("div") ? "textContent" : "innerText";

function strTrim(str) {
    if (!str) {
        str = "";
    }
    return str.replace(/^\s+|\s+$/g, "");
}

function addEvent(element, eventName, callback) {
    if (element.addEventListener) {
        element.addEventListener(eventName, callback, false);   
    } else if (element.attachEvent) {
        element.attachEvent("on" + eventName, callback);
    }
}

function editableClickHandler(e) {
    var actionButton, pNode, myText, myEditor;

    actionButton = this;
    pNode = actionButton.parentNode;
    myText = pNode.querySelector("span.text");
    myEditor = pNode.querySelector("input.editor");

    if (actionButton.value === "Edit") {
        actionButton.value = "Done";
        pNode.className += " editing";
        myEditor.setAttribute("data-original-val", myText[textProp]);    // Save current value in case of canceling
        myEditor.value = myText[textProp];
    } else {
        actionButton.value = "Edit";
        pNode.className = "editable";
        myText[textProp] = myEditor.value;
    }
}

function escapeCheckHandler(e) {
    var keyCode, pNode, myEditor, myText, myActionButton;

    e = e || window.event;    // Normalize event
    keyCode = e.keyCode || e.which || e.charCode;    // Normalize keycode

    if (keyCode === 27) {    // Escape key
        pNode = this.parentNode;
        myEditor = pNode.querySelector("input.editor");
        myText = pNode.querySelector("span.text");
        myActionButton = pNode.querySelector("input.action");

        pNode.className = "editable";
        myText = myEditor.getAttribute("data-original-val");
        myActionButton.value = "Edit";
    }
}

function addClickHandler() {
    var target, curInput, curInputVal, newP, newText, newEditor, newActionButton, newEscapeInfo;

    curInput = document.getElementById("txt1");
    curInputVal = strTrim(curInput.value);

    if (!curInputVal) {
        alert("Must provide actual text");
        return;
    }

    target = document.getElementById("targetArea");
    newP = document.createElement("p");
    newText = document.createElement("span");
    newEditor = document.createElement("input");
    newActionButton = document.createElement("input");

    newP.className = "editable";

    newText.className = "text";
    newText[textProp] = curInputVal;
    newP.appendChild(newText);

    newEditor = document.createElement("input");
    newEditor.type = "text";
    newEditor.className = "editor";
    addEvent(newEditor, "keyup", escapeCheckHandler);
    newP.appendChild(newEditor);

    newActionButton.type = "button";
    newActionButton.className = "action";
    newActionButton.value = "Edit";
    addEvent(newActionButton, "click", editableClickHandler);
    newP.appendChild(newActionButton);

    newEscapeInfo = document.createElement("em");
    newEscapeInfo.className = "escape";
    newEscapeInfo[textProp] = "(Press Escape to Cancel Editing)";
    newP.appendChild(newEscapeInfo);

    curInput.value = "";
    target.insertBefore(newP, target.firstChild);
}

function loadHandler() {
    addEvent(document.getElementById("btn1"), "click", addClickHandler);
}

addEvent(window, "load", loadHandler);

演示：http: //jsfiddle.net/8K3pN/2/

的使用addEvent有助于跨浏览器更一致地绑定事件处理程序。

总体而言，当您填写文本框并单击按钮时，它会<p>向目标区域添加一个（带有一些子元素）。根据 的状态p，某些东西被隐藏/显示（使用 CSS）。并且根据单击按钮的状态（编辑/完成），某些事情会发生。我添加了按 Escape 键“取消”编辑的功能（而不是添加另一个按钮）。

同样，我知道这可能太多了，但我希望这可以帮助您了解这一切如何协同工作！

于 2013-06-29T17:13:52.093 回答
0

正如其他人所说，我们不确定您要完成什么，但是您可以使用该document.createElement()函数从 JavaScript 将元素添加到文档中。您可以提供一个文本框来输入文本，然后调用一个 JS 函数将一个段落添加到您的 div 中。

于 2013-06-29T05:22:01.130 回答
0

这是你的想法吗？

<!doctype html>
    <html>
    <head>
    <script type="text/javascript">
        var count = 1;
        function newPara() {
            var new_p = document.createElement('p');
            new_p.setAttribute('class','pClass');
            new_p.setAttribute('id','new_para_'+ count++);

            var newContent = document.createTextNode(document.getElementById('content').value);
            new_p.appendChild(newContent);

            document.getElementsByTagName('body')[0].insertBefore(new_p,document.getElementById('create'));
        }
    </script>
    </head>
    <body>
    <p class=”pClass”&gt;This is in a paragraph. <br/></p>


    <div id="create">
    <textarea id="content"> </textarea>
    <button onclick="newPara();"> Create </button>
    </div>


    </body>
    </html>
于 2013-06-29T05:51:20.537 回答